In which of these scenarios is a queue data structure a suitable choice?
Storing a list of recently opened files in an operating system.
Managing function calls in a recursive program.
Handling requests in a multi-threaded environment based on their arrival order.
Implementing an undo/redo functionality in a text editor.
In a circular queue implemented using an array of size 5, the front is at index 3, and the rear is at index 1. What happens after two dequeue operations?
The front moves to index 0, and the rear moves to index 4.
The front moves to index 0, and the rear remains at index 1.
The front moves to index 1, and the rear moves to index 4.
The queue becomes empty.
What is the main advantage of using a circular array for implementing a queue compared to a regular array?
Faster access to individual elements
Reduced memory consumption
Efficient utilization of space after multiple enqueue and dequeue operations
Better handling of sorted data
What is the primary characteristic that distinguishes a queue from other linear data structures?
It is a sorted data structure.
It allows for random access of elements.
Elements are added and removed from the same end.
Elements are added at one end and removed from the other.
What data structure is used to implement a priority queue?
Stack
Array
Linked List
Heap
What is the purpose of the 'front' pointer in an array implementation of a queue?
It points to the element that has been in the queue the longest.
It points to the next available empty location.
It tracks the total number of elements in the queue.
It points to the most recently added element.
What is the maximum number of elements a circular queue of size 'n' can hold?
n
n + 1
It depends on the implementation
n - 1
What value does the 'isEmpty' operation on a queue return if the queue contains no elements?
0
The first element in the queue
True
-1
When would it be more advantageous to use a linked list implementation of a queue over an array-based implementation?
When dynamic resizing and the potential for overflow are concerns.
When memory usage needs to be tightly controlled.
When the maximum number of elements in the queue is known in advance.
When dealing with a small, fixed number of elements.
What is the worst-case time complexity of searching for an element in a queue implemented using a linked list?
O(n)
O(log n)
O(1)
O(n log n)